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Many chemotherapy drugs act preferentially on cancer cells because those cells

  • A.lack any plasma membrane surrounding them at all
  • B.are physically larger than every normal cell type
  • C.divide more frequently than most normal cells
  • D.have a completely different genetic code from ours

Answer: C

Agents that damage DNA or disrupt the spindle harm dividing cells most, which is why hair follicles and the gut lining also suffer. The selectivity is a matter of degree rather than of kind. Newer targeted therapies aim to exploit differences that are more specific.

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